Because

John Lennon got the idea for this song when he heard Yoko Ono playing Beethoven's "Moonlight Sonata" on the piano. He asked her to play it backwards, and came up with "Because" based on what he heard. John said, "I was lying on the sofa in our house, listening to Yoko play Beethoven's 'Moonlight Sonata' on the piano. Suddenly, I said 'Can you play those chords backward?' She did, and I wrote 'Because' around them. The song sounds like 'Moonlight Sonata,' too. The lyrics are clear, no bulls--t, no imagery, no obscure references."

The vocals are a 3-part harmony by Lennon, Paul McCartney, and George Harrison that was overdubbed twice, creating a 9-part harmony. This is the only Beatles song with three singers throughout.

Lennon said the arrangement was terrible, but McCartney and Harrison both cited "Because" as the best track on Abbey Road, noting the 3-part harmony.